SU1469392A1 - Method of spectromic determination of n-acyl-n nъ-bis-oxiethylenediamine in working zone air - Google Patents

Description

(21) 4205769 / 28-25

(22) 03/03/87

(46) 03/30/89. Bup. № 12

(71) Ufa Research Institute of Hygiene and Occupational Diseases

(72) L.I. Trubnikova and O.N. Dubinina

(53) 543.422.4 (088.8)

(56) Anashkina A.A. et al. A technique for the titrimetric determination of N- -acyl-K, H-bis- | 5-hydroxyethylethylenediamine in the working area air. IN Soyuzbytkhim, Tula branch of VNShkhimproekt, Shchekino, 1984.

Trubnikova L.I. Method for determination of H-acyl-K, N-bis-α-oxyethyl-ethylenediamine in the air of the seed chambers. UFNII GiPZ, Ufa, 1985.

(54) METHOD OF SPECTROPHOTOE OF METRIC DETERMINATION N-A1№-N, N -BIS-OXYETHYLETHYLENEDIAMINE IN THE AIR OF THE WORKING ZONE

(57) The invention relates to the field of chemical analysis and can be used in sanitary-hygienic studies in the production of surfactants. The aim of the invention is to increase the accuracy, relative and absolute sensitivity of the method of spectrophotometric determination of K-adyl-S, S-bis- / 5-hydroxyethylethylenediamine in the air of the working area. The essence of the invention consists in extracting the compound N-acyl-N, N-bis-p-hydroxyethyls of tylenediamine with methyl 1.2-dichloroethane from a solution with a pH of 4.0-4.1 and photometry the extract at a wavelength of 430 nm. 1 il.

but

(L

one.

The invention relates to chemical analysis and can be used to determine the content of N- -adyl-H, S-bis-oxyethylethylenediamine in the air of the working area for the production of surface-active substances (SAS) in sanitary-hygienic studies.

The purpose of the invention is to increase the relative and absolute sensitivity, as well as the accuracy of the method of spectrophotometric determination of N-aumi-N, N-bis-p-hydroxyethylethylenedia-. amine in the air of the working area.

The drawing shows the absorption spectra of the compound N-adyl-N, N - -bis-p-hydroxyethylethylenediamine with ME-7

tilorange (curve 1) and the metilorange (curve 2).

Air at a speed of 0.5 l / min was passed through an absorber filled with 5 ml of ethyl alcohol, and at a speed of 3-5 l / min through a cartridge with a paper filter connected by means of a tee with each other and with an air medium. The filter was poured with 10 ml of ethyl alcohol, held for 30 minutes and selected for analysis 5 mp. Alcohol solutions from the absorber and obtained after processing the filter were placed in separating funnels, added 15 ml of water, 5 ml of buffer solution pH 4, 1 mp O, 1% methyl orange, 11 MP 1,2-dichloroethane.

four

O5 CO

tc

Extracted for 2 minutes. Extraction shred twice. The dichloroethane solution was adjusted to 25 ml with a propyl alcohol, the optical density was measured on a spectrophotometer at a wavelength of 430 nm in a cuvette with an absorbing layer thickness of 50 mm relative to a mixture of 22 MP of 1,2-dichloroethane and 3 ml of propyl alcohol. The lower limit of measurement is 2 µg in the sample volume being analyzed.

The concentration was calculated by the formula:

X -, V,

where С is the quantity of Н-ацш1-Н, Н-bis - - oxyethylethylenediamine, found in the analyzed sample volume, µg total sample volume, mp; sample volume taken for analysis, ml

the volume of the sample of the drawn vodkha, l, reduced to standard conditions by the formula:

 Vj (273 + 20) -Р (273 + t) -101.33

V, - V

.0

ten

360 t w ffzo kQ ft6o w

l, HM

V - air volume, selected

for analysis, Lj P - barometric pressure,

KPA;

t is the air temperature at the sampling location, ° C.

Claims (1)

Formula invented and A method for the spectrophotometric determination of K-adyl-K, K -bis-p-hydroxy-ethylethylenediamine in the air of the working area, consisting in taking air samples into ethanol, characterized in that, in order to increase the relative and absolute sensitivity, Also, the accuracy of the method, after sampling air into ethyl alcohol, is added to the resulting solution, methyl orange, extracted with .1,2-dichloroethane compound M-a; il-H, H - -bis-p-hydroxyethylethylenediamine with methyl orange at pH 4 , propyl alcohol is added and the optical density is measured. di- hloretanovogo be obtained extract at a wavelength of A 430 nm.